It is very common, and well-defined, for a pointer on one side of a C ABI
to have a different but compatible element type. Examples include:
- `char*` vs `uint8_t*` on a system with 8-bit bytes
- `const char*` vs `char*`
- `char*` vs `unsigned char*`
Without this flag, Clang would invoke UBSAN when such an extern
function was called.
Might be nice to file an upstream issue and find out if there is a more
precise way to disable the problematic check.
`-fsanitize-cfi-icall-generalize-pointers` looks promising according to
the documentation, but empirically it does not work.
release/17.x branch, commit 8f4dd44097c9ae25dd203d5ac87f3b48f854bba8
This adds the flag `-D_LIBCPP_PSTL_CPU_BACKEND_SERIAL`. A future
enhancement could possibly pass something different if there is a
compelling parallel implementation. That libdispatch one might be worth
looking into.
* some manual fixes to generated CPU features code. in the future it
would be nice to make the script do those automatically. I suspect
the sm_90a thing is a bug in LLVM.
* add liteos to various target OS switches. I know nothing about this
OS; someone will need to work specifically on support for this OS
when the time comes to support it properly in zig.
* while waiting for the compiler, I went ahead and made more
conservative choices about when to use `inline` in std/Target.zig
Currently, the compiler (like @typeName) writes it `fn(...) Type` but
zig fmt writes it `fn (...) Type` (notice the space after `fn`).
This inconsistency is now resolved and function types are consistently
written the zig fmt way. Before this there were more `fn (...) Type`
occurrences than `fn(...) Type` already.
Safety is not a global flag that should be enabled or disabled for all
stores - it's lowered by the frontend directly into AIR instruction
semantics. The flag for this is communicated via the `store` vs
`store_safe` AIR instructions, and whether to write 0xaa bytes or not
should be decided in `airStore` and passed down via function parameters.
This commit is a step backwards since it removes functionality but it
aims our feet towards a better mountain to climb.
C99 introduced designated initializers for structs. Omitted fields are
implicitly initialized to zero. Some C APIs are designed with this in
mind. Defaulting to zero values for translated struct fields permits Zig
code to comfortably use such an API.
Closes#8165
This introduces the concept of a "weak global name" into translate-c.
translate-c consists of two passes. The first is important, because it
discovers all global names, which are used to prevent naming conflicts:
whenever we see an identifier in the second pass, we can mangle it if it
conflicts with any global or any other in-scope identifier.
Unfortunately, this is a bit tricky for structs, unions, and enums. In
C, these types are not represented by normal identifers, but by separate
tags - `struct foo` does not prevent an unrelated identifier `foo`
existing. In general, we want to translate type names to user-friendly
ones such as `struct_foo` and `foo` where possible, but we can't
guarantee such names will not conflict with real variable names.
This is where weak global names come in. In the initial pass, when a
global type declaration is seen, `struct_foo` and `foo` are both added
as weak global names. This essentially means that we will use these
names for the type *if possible*, but if there is another global with
the same name, we will mangle the type name instead. Then, when actually
translating the declaration, we check whether there's a "true" global
with a conflicting name, in which case we mangle our name. If the
user-friendly alias `foo` conflicts, we do not attempt to mangle it: we
just don't emit it, because a mangled alias isn't particularly helpful.
The _environ variable that is populated when linking libc on Windows does not support Unicode keys/values (or, at least, the encoding is not necessarily UTF-8). So, for Unicode support, _wenviron would need to be used instead. However, this means that the keys/values would be encoded as UTF-16, so they would need to be converted to UTF-8 before being returned by `os.getenv`. This would require allocation which is not part of the `os.getenv` API, so `os.getenv` is not implementable on Windows even when linking libc.
Closes https://github.com/ziglang/zig/issues/8456
this will make s3 re-enable compression for the stdlib's autodoc
and improve loading times (and data usage) for users
alongside this commit the deploy script for the official website is also
being updated
Consider this C macro:
```c
#define FOO(x) struct x
```
Previously, translate-c did not detect that the `x` in the body referred
to the argument, so wrongly translated this code as using the
nonexistent `struct_x`. Since undefined identifiers are noticed in
AstGen, this prevents the translated file from being usable at all.
translate-c now instead detects this case and emits an appropriate
compile error in the macro's place.
